opaque filter inside slr

["bulrich" <bulrich@xxxxxxxxx>]

hi!
I recently read an article about IR photo, talking about putting a gel
filter "somewhere" behind the mirror of SLR camera, for avoiding the on and
off of the opaque filter. 
Few questions about that:
1. can I do that myself, is it easy?

2. where exactly in the camera, from the front or the back?

3. where can I find that kind of filter, is it expensif?


thanks everyone for your time, I'm a beginer in IR photo.

Ben Ulrich, 
montreal canada

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